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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:汪家有两个与众不同的女儿：姐姐绿萍（秦岚 饰）是出色的芭蕾舞演员，而妹妹紫菱（张嘉倪 饰）是一个平凡而爱做梦的女孩。他们同时爱上了世交楚家的儿子楚濂（保剑锋 饰），然而楚濂爱的却是大家都没想到的紫菱。二人甜蜜的恋爱在绿萍的车祸中失去，楚濂为了责任迎娶绿萍。而心碎的紫菱则跟着大自己十九岁的费云帆（方中信 饰）远嫁海外。费云帆用尽心机去令紫菱适应新环境，开始新生活。当绿萍无意中发现当年楚濂与紫菱的恋爱后，平静的生活被打破了。2. Import any icon into AI. We can press the up and down keys to move the icon first.Come on, come on, come onBased on the BIM model of the industry plan. The information model provides spatial location data, which can be adjusted at any time through collision inspection to achieve the purpose of rapid optimization. Collision detection is automatically completed by BIM system, and detection reports are listed in real time to avoid manual inspection omission. Compared with traditional CAD methods, collision detection has higher efficiency and accuracy.　　面对前所未有的危机，能拯救人类的只有那群战士。凌驾前作的规模，前所未见的动作场面，不该有交集的英雄们终于相遇。谜团重重的故事即将解开